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Alcoholic Liver Disease and Its Relationship with Metabolic Syndrome

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Alcoholic Liver Disease and Its Relationship with Metabolic Syndrome Research and Reviews Alcoholic Liver Disease and Its Relationship with Metabolic Syndrome JMAJ 53(4): 236–242, 2010 Hiromasa ISHII,*1 Yoshinori HORIE,*2 Yoshiyuki YAMAGISHI,*3 Hirotoshi EBINUMA*3 Abstract Alcoholic liver disease (ALD), which occurs from chronic excessive drinking, progresses from initial alcoholic fatty liver to more advanced type such as alcoholic hepatitis, liver fibrosis, or liver cirrhosis when habitual drinking continues. In general, chance of liver cirrhosis increases after 20 years of chronic heavy drinking, but liver cirrhosis can occur in women after a shorter period of habitual drinking at a lower amount of alcohol. Alcoholic liver cirrhosis accounts for approximately 20% of all liver cirrhosis cases. The key treatment is abstinence or substantial cutting down on drinking; the prognosis is poor if the patient continues drinking after being diagnosed with liver cirrhosis. Factors that exert adverse effects on the progression of ALD include gender difference, presence of hepatitis virus, immunologic abnormality, genetic polymorphism of alcohol-metabolizing enzymes, and complication of obesity or overweight. Recently, particular attention has been paid to obesity and overweight as risk factors in the progression of ALD. Conditions such as visceral fat accumulation, obesity, and diabetes mellitus underlie the pathologic factor of metabolic syndrome (MetS). In liver, MetS may accompany fatty liver or steatohepatitis, with possible progression to liver cirrhosis in some cases. Caution is required for patients with MetS who have a high alcohol intake because alcohol consumption further accelerates the progression of liver lesions. Key words Alcoholic liver disease, Metabolic syndrome, Obesity, NAFLD/NASH Introduction following hypertension and smoking, as a global disease burden. Organ damage caused by alcohol There are many types of liver disease, but alco- can occur not only in the liver but also in many holic liver disease (ALD) is unique in the way other organs including gastrointestinal tract, pan- that it occurs when the patient habitually con- creas, circulatory organs, cranial nerves, and sumes excessive amounts of alcohol through his blood, which is why the medical and social impact or her own volition. Because alcoholic beverages is great. are popular as a lifestyle habit globally and have This paper provides basic information on been established as part of everyday life, ALD ALD and also discusses metabolic syndrome that occurs as a result of excessive alcohol is (MetS) which is the focus of a specific health an important lifestyle-related disease that is screening/guidance program that begun in April prevalent throughout the world. According to 2008 in Japan as well as the influence of alcohol a WHO estimate, alcohol intake ranks third intake. *1 Professor Emeritus, Division of Gastroenterology and Hepatology, Keio University School of Medicine, Dept. of Internal Medicine, Tokyo, Japan (As of May 2010). *2 Department of Gatroenterology, Eiju General Hospital, Tokyo, Japan ([email protected]). *3 Division of Gastroenterology and Hepatology, Keio University School of Medicine, Dept. of Internal Medicine, Tokyo, Japan. This article is a revised English version of a paper originally published in the Journal of the Japan Medical Association (Vol.138, No.6, 2009, pages 1107–1112). 236 JMAJ, July/August 2010 — Vol. 53, No. 4 ALCOHOLIC LIVER DISEASE AND ITS RELATIONSHIP WITH METABOLIC SYNDROME Chronic excessive use of alcohol Continuous drinking Complete abstinence or Fatty liver Liver fibrosis cutting down on drinking Continuous Continuous Cured drinking episode drinking Abstinence Alcoholic hepatitis Liver cirrhosis Progression Hepatocellular Death carcinoma Fig. 1 Types of alcoholic liver diseases and progression processes Major Types of ALD and Their failure, gastrointestinal bleeding, and other con- Characteristic Features in Japan (Fig. 1) ditions occur, frequently accompanied by with- drawal syndrome. At this point, prognosis is poor. The disease initially caused by chronic excessive Common histopathologic findings include alcohol consumption is fatty liver disease. It is hepatocyte necrosis, infiltration of polymorpho- said that more than half of regular drinkers nuclear leukocytes, ballooning of hepatocytes, (those who drink alcoholic beverages equivalent cholestasis, and peri-cellular fibrosis. Labora- of 60 g of ethanol or more per day, 5 or more days tory tests commonly reveal hyperbilirubinemia, a week, which corresponds to roughly 0.5 L of aspartate aminotransferase (AST)-dominant Japanese sake, 3 half-litter bottles of beer, 6 shots transaminase elevation (increased AST/alanine of whisky, or 5 glasses of wine or more per day) aminotransferase (ALT) ratio), marked increase eventually develop fatty liver. Fatty liver is a in ␥-glutamyl transpeptidase (GTP), polymor- condition in which triglyceride accumulates in phonuclear leukocytosis, hypertriglyceridemia, hepatocyte, causing the enlargement of hepato- and hyperuricemia. cyte and disturbances of blood circulation within Unlike in European or North American coun- the sinusoids, causing adverse effects on various tries, it is not rare in Japan that patients with metabolic processes within the cells. In recent alcoholic fatty liver have relatively mild symp- years, changes in dietary habits to European/ toms with no serious clinical conditions. Yet, American styles have caused increases in fat when such people continue to drink alcoholic intake among Japanese people. Combined with beverages regularly (in the amount equivalent to excessive alcohol intake and overnutrition, it is 60 g/day or more of ethanol), they are likely to causing more advanced fatty liver among people. develop liver fibrosis, which then progresses to Signs and symptoms found in patients with fatty alcoholic liver fibrosis and, consequently, to liver liver are usually no worse than hepatomegaly cirrhosis. Alcoholic liver cirrhosis reportedly with abdominal fullness and malaise, and even occurs in 10–30% of alcoholics. Our own case asymptomatic cases are not rare. studies showed that cirrhosis occurred frequently When patients with alcoholic fatty liver abruptly among heavy drinkers who have at least 20 years increase their alcohol consumption and remains of drinking history at the consumption level of that way (continuous drinking episode), 10–20% 0.9 L/day or more of sake (100–120 g/day or of them develop alcoholic hepatitis (Fig. 1). Clini- more as ethanol). Among women, however, we cal manifestations of alcoholic hepatitis include found cases of liver cirrhosis with only 12 to 15 upper abdominal pain, jaundice, fever, vomiting, years of habitual drinking at the 2/3 of the said and diarrhea. When progressed, pneumonia, renal level. The recent nationwide survey we con- JMAJ, July/ August 2010 — Vol. 53, No. 4 237 Ishii H, Horie Y, Yamagishi Y, et al. AlcםHCVםHCV HBVםAlc HBVםHBV HBV Alc Alc OthersםHCV HCV 12% 14% (9,126סYe ar 2008 (n (21,769סYe ar 1998 (n Alcoholic (alc) origin 12% Alcoholic (alc) origin 14% viral origin 6%םviral origin 15% Both alcoholicםBoth alcoholic Total 27% Total 20% [Cited from Horie et al. (2009).3] Fig. 2 Proportion of liver cirrhosis that are of alcoholic origin ducted has revealed that alcoholic liver cirrhosis return to heavy drinking. Thus, it is often difficult is frequent among those with 30 years or more of to have them maintain abstinence. habitual drinking at the consumption level of Fatty liver improves after about 4 weeks of 0.9 L/day or more of sake while women tend to abstinence, often showing reduction of hepato- develop liver cirrhosis after about 20 years of ha- megaly. Hospitalization is necessary in patients bitual drinking at the 2/3 of the same amount.1 with alcoholic hepatitis or liver fibrosis accom- A case where an alcoholic liver cirrhosis patient panied by abdominal pain, fever, and jaundice. developed hepatocellular carcinoma without The prognosis is poor for patients with severe complication of viral hepatitis has also been alcoholic hepatitis, often requiring multidiscipli- reported. nary therapy (including the use of an artificial According to a recent survey, alcoholic liver liver-support system). cirrhosis accounts for approximately 20% of all Patients with non-compensatory liver cirrho- liver cirrhosis cases (Fig. 2).2,3 The prognosis of sis should be hospitalized and receive the same alcoholic liver cirrhosis varies widely, depending treatment as liver cirrhosis of other pathogenesis. on whether or not abstinence is continued after Additionally, they should be subjected to alcohol diagnosis was established. In our experience, the abstinence education for the purpose of tran- survival rate (at 4.4 years after the diagnosis) was sitioning to the compensatory phase. Alcoholics 35% in patients who continued to drink, whereas are unable to restrain themselves from drinking it was 88% in those who abstained from alcohol. once they start, and therefore they require This clearly shows the importance of abstinence lifestyle guidance to reach the state of complete in ALD treatment. abstinence from alcohol. In contrast, if the patients are not alcoholic and are fully aware of Key Points of ALD Treatment the fact that their disease is derived from their excessive drinking, then, providing guidance to The most important issue in the ALD treatment cut down on drinking may be deemed sufficient, is abstinence and its continuation. In particular, allowing about 0.18 L/day of sake with 2 days of most patients with liver cirrhosis
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